Great Plains 3PYP Operator Manual - Manual (Page 66)

62 3PYP Table of Contents Index Great Plains Manufacturing, Inc.
401-312M Table of Contents Index 2014-09-09
Refer to Figure 65
An adjuster cam sets down pressure individually for
each row unit. This is useful for penetrating hard soil and
planting in tire tracks. For best results always adjust
tractor tires so they are not ahead of 30 inch rows.
Use only enough down pressure to cut the seed trench
and maintain proper soil-firming over seed. Excessive
row unit down force will lead to premature wear on row
unit components, uneven seed depth and gauge wheel
slippage (unless hydraulic down force is used).
Adjusting Down-Pressure
Refer to Figure 64 (on page 62, shown at cam setting 2),
Figure 65 and Figure 66
To adjust down pressure, use a 1
1 ⁄
8
inch (29 mm) open
end wrench or the tool stored under the walkboard.
3PYP must be unfolded for this adjustment.
1. Raise the planter. Although this adjustment can be
made with the planter lowered, the springs will be in
tension, and will require more effort. The extra force
required may also damage tools.
2. Install lift assist cylinder locks.
3. Put tractor in Park and shut it off.
4. Position wrench on the fixed nut near or slightly
forward of vertical.
5. Pull upper spring link back.
6. Move the adjustment cam to the new setting on the
spring adjust bar
.
Note: Do not set all rows higher than notch four. Using
high settings across all rows causes uneven
planting. Individual rows may be set higher if
running in tire tracks.
Cam Notch Down-Force
a
a. Includes both spring force and row unit weight.
zero (out of notch) Maintenance Only
one 345 lbs (156 kg)
two 370 lbs (168 kg)
three 400 lbs (181 kg)
four 450 lbs (204 kg)
five 500 lbs (227 kg)
six 550 lbs (249 kg)
tip Do Not Use
Figure 64
25 Series Row Unit
Spring Adjustment
25268
2
6
4
5
3
2
Figure 65
Row Unit Minimum Cam (one)
27065
3
4
Figure 66
Row Unit Maximum Cam (six)
27065
5
6